java - Spring 数据 : How to write a record in join table for unidirectional one-to-may?

Question

我有一个Subscription 类和Payment 类。当我执行以下操作时，它不会在连接表中创建记录。我应该使用中间类还是可以在没有它的情况下创建这样的记录？ subscriptionRepository 是来自 Spring-Data 的 CrudRepository。

@Transactional
public Subscription activate(@Valid Subscription subscription, @Valid Payment payment) {
    Set<Payment> payments = subscription.getPayments();
    if (payments == null)
        payments = new HashSet<>();

    payments.add(payment);

    return subscriptionRepository.save(subscription);
}

类:

订阅:

@Entity
public class Subscription {
...
    @OneToMany(fetch = FetchType.EAGER, cascade = CascadeType.ALL)
    @JoinTable(
            joinColumns = {@JoinColumn(name = "subscription_id", referencedColumnName = "id")},
            inverseJoinColumns = {@JoinColumn(name = "payment_id", referencedColumnName = "id", unique = true)}
    )
    @Getter @Setter
    private Set<Payment> payments;
}

付款方式:

@Entity
public class Payment {
    @Column
    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    @JsonIgnore
    private Integer id;

    @Column(nullable = false)
    private PaymentType paymentType;

    @Past
    @Column(nullable = false)
    private Date date;

    public enum PaymentType {
        MONEY,
        PROMO_CODE,
        TRIAL
    }
}

Answer 1

你忘了在订阅中注入(inject)付款，你的存储库和 pojo 看起来还不错

if (payments == null) {
    payments = new HashSet<>();
    subscription.setPayments(payments);
 }